在一个通道开路，另一个通道闭路时进行测量。
The measurement is made with one channel open and one channel closed.
但周一时，此前被禁止踏入法院的记者获准来到法院七层的一间屋子，通过闭路电视收看宣判的情景。
But on Monday, journalists previously barred from the court property were permitted to watch the final proceedings by closed-circuit television from a courtroom annex.
另外，24小时保安服务、闭路电视监控、精密警报及出入管理控制系统均有效确保高度严密的保安。
In addition, the 24-hour security service, CCTV monitoring, alarm and access control precision control systems are effective in ensuring a high degree of tight security.
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